from sqlalchemy import Column, Integer, String, Text, DateTime, Float, Boolean, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship
from datetime import datetime

Base = declarative_base()

class WorkOrder(Base):
    """工单模型"""
    __tablename__ = "work_orders"
    
    id = Column(Integer, primary_key=True)
    order_id = Column(String(50), unique=True, nullable=False)
    title = Column(String(200), nullable=False)
    description = Column(Text, nullable=False)
    category = Column(String(100), nullable=False)
    priority = Column(String(20), nullable=False)
    status = Column(String(20), nullable=False)
    created_at = Column(DateTime, default=datetime.now)
    updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)
    resolution = Column(Text)
    satisfaction_score = Column(Float)
    
    # 关联对话记录
    conversations = relationship("Conversation", back_populates="work_order")

class Conversation(Base):
    """对话记录模型"""
    __tablename__ = "conversations"
    
    id = Column(Integer, primary_key=True)
    work_order_id = Column(Integer, ForeignKey("work_orders.id"))
    user_message = Column(Text, nullable=False)
    assistant_response = Column(Text, nullable=False)
    timestamp = Column(DateTime, default=datetime.now)
    confidence_score = Column(Float)
    knowledge_used = Column(Text)  # 使用的知识库条目
    response_time = Column(Float)  # 响应时间（秒）
    
    work_order = relationship("WorkOrder", back_populates="conversations")

class KnowledgeEntry(Base):
    """知识库条目模型"""
    __tablename__ = "knowledge_entries"
    
    id = Column(Integer, primary_key=True)
    question = Column(Text, nullable=False)
    answer = Column(Text, nullable=False)
    category = Column(String(100), nullable=False)
    confidence_score = Column(Float, default=0.0)
    usage_count = Column(Integer, default=0)
    created_at = Column(DateTime, default=datetime.now)
    updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)
    is_active = Column(Boolean, default=True)
    is_verified = Column(Boolean, default=False)  # 是否已验证
    verified_by = Column(String(100))  # 验证人
    verified_at = Column(DateTime)  # 验证时间
    vector_embedding = Column(Text)  # 向量嵌入的JSON字符串

class VehicleData(Base):
    """车辆实时数据模型"""
    __tablename__ = "vehicle_data"
    
    id = Column(Integer, primary_key=True)
    vehicle_id = Column(String(50), nullable=False)  # 车辆ID
    vehicle_vin = Column(String(17))  # 车架号
    data_type = Column(String(50), nullable=False)  # 数据类型（位置、状态、故障等）
    data_value = Column(Text, nullable=False)  # 数据值（JSON格式）
    timestamp = Column(DateTime, default=datetime.now)  # 数据时间戳
    is_active = Column(Boolean, default=True)  # 是否有效
    
    # 索引
    __table_args__ = (
        {'extend_existing': True}
    )

class Analytics(Base):
    """分析统计模型"""
    __tablename__ = "analytics"
    
    id = Column(Integer, primary_key=True)
    date = Column(DateTime, nullable=False)
    total_orders = Column(Integer, default=0)
    resolved_orders = Column(Integer, default=0)
    avg_resolution_time = Column(Float, default=0.0)
    satisfaction_avg = Column(Float, default=0.0)
    knowledge_hit_rate = Column(Float, default=0.0)
    category_distribution = Column(Text)  # JSON格式的类别分布
    created_at = Column(DateTime, default=datetime.now)

class Alert(Base):
    """预警模型"""
    __tablename__ = "alerts"
    
    id = Column(Integer, primary_key=True)
    rule_name = Column(String(100), nullable=False)
    alert_type = Column(String(50), nullable=False)
    level = Column(String(20), nullable=False)  # info, warning, error, critical
    message = Column(Text, nullable=False)
    data = Column(Text)  # JSON格式的预警数据
    is_active = Column(Boolean, default=True)
    created_at = Column(DateTime, default=datetime.now)
    resolved_at = Column(DateTime)